Portable shelter frame



FIG. 1 is a lower perspective view of a portable shelter frame showing my new design and in use with a canopy of a portable shelter;

FIG. 2 is an upper perspective view of the portable shelter frame of FIG. 1 isolated from the canopy; and,

FIG. 3 is an upper perspective view of an alternative state of the portable shelter frame of FIG. 1 isolated from the canopy.

The broken lines in FIG. 1 represent an exemplary canopy under which the portable shelter frame resides and forms no part of the claimed design. 

CLAIM The ornamental design for a portable shelter frame, as shown and described. 